公开(公告)号：US10902767B1

公开(公告)日：2021-01-26

申请号：US16726962

申请日：2019-12-26

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsung-Hau Chang ,  Chi-Wei Liu ,  Ping Chen

IPC: G09G3/20

Abstract: A driving circuit of display apparatus includes an operational amplifier (OP), comprising a plurality of input terminals; a digital-to-analog converter (DAC); a multiplexer, coupled to the OP and the DAC, comprising a plurality of switches; and a boosting module, configured to decrease an equivalent time constant between the DAC and the OP to increase an output slew rate of the OP in a boosting period; wherein the boosting period is enabled before a steady state of the OP.

公开(公告)号：US11176861B2

公开(公告)日：2021-11-16

申请号：US17088600

申请日：2020-11-04

Applicant: NOVATEK Microelectronics Corp.

Inventor： Syang-Yun Tzeng ,  Cheng-Tsu Hsieh ,  Ching-Wen Hou ,  Ying-Hsiang Wang ,  Ping Chen

IPC: G09G3/00

Abstract: An electronic device includes a substrate and a display driver chip bonded on the substrate. The display driver chip includes a plurality of operational amplifiers, and each of the operational amplifiers has a first stage and a second stage. The first stage includes a first power input terminal. The second stage includes a first power input terminal and an output terminal for outputting an output voltage. The first power input terminal of the first stage is connected to a first metal trace of the substrate, and the first power input terminal of the second stage is connected to a second metal trace of the substrate. The first power input terminal of the first stage and the first power input terminal of the second stage are both provided with a first voltage level.